(Note: make a table of letters, whether theres a keyword or none, 5x5 from A to Z, where C/K and I/J are interchangeable.)
Legends:
N ~ North
E ~ East
W ~ West
S ~ South
NE ~ North East
NW ~ North West
SE ~ South East
SW ~ South West
A | B | C | D | E
F | G | H | I | J
L | M| N | O | P
Q | R | S | T | U
V | W| X | Y | Z
Example:
Ciphertext: NWFNVNEDSBWISWFN
N(W) F(N) V(NE) D(S) B(W) I(SW) F(N)
Plaintext: MARIANA
